test(@embark/communication): fix failing test (#1979)

In d6bf5c24b9 we've ensured that certain modules of
embark only executed if their functionality is actually enabled.
This broke one of our tests in the communication module.
This commit fixes the test by explicitly enabling the module's functionality.

packages/stack/communication/test/communication.spec.js

@@ -42,7 +42,8 @@ describe('stack/communication', () => {
 
   test('it should register and start communication node', () => {
     const communicationConfig = {
-      provider: 'whisper'
+      provider: 'whisper',
+      enabled: true
     };
 
     const processRegisterHandler = sinon.spy((name, fns) => {});